HAP·TCP Composite Biomaterials Strengthened by Spinel

Ca10(PO4)6(OH)2·Ca2(PO4)3-MgAl2O4 (HAP·TCP-Spinel) composite biomaterials were synthesized by chemical deposition and followed by powder metallurgy technique. Mi-crostructures were characterized by fourier transform infrared spectroscopy (FTIR), X-ray diffrac-tion(XRD), scan electron microscopy(SEM), and transmission electron microscopy(TEM). TEM observation shows that a perfect combination is presented in the interface between HAP crystals and Spinel crystals. The effects of composition on mechanical properties investigated show that the highest compressive strength and bending strength are σb=212MPa and σt=352MPa respectively, matching the composition of 62.5wt% of HAP in the composite. Similar to HAP, the composite is available to adsorb serum protein and albumin protein, though the amount of protein adsorption on the surface of the composite is significantly less than that on surface of HAP.